body {
  background-color: #000;
  width: 100ww;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;

  #app {
    width: 900px;
    height: 600px;
    background-color: #16a085;

    canvas {
      position: absolute;
    }
  }
}
